Ok. I know that Quora isn't a forum. It is more of a Q&A site. It has questions and answers both contributed by the members. Now, forums have existed on the internet for over a decade. Some forums such as DigitalPoint are really popular and people have been using that kind of "interface" for a long time. I just want to ask the engineers here, what makes Quora so different and successful than others? - Is it its easy to use interface? (All that you see when you open the page is the Ask a Question text box) - Is it the fact that people can vote up answers so members feel awesome that their answer got a lot of backers? - Is it the fact that most of its members are good, informed people who take time out to contribute valuable answers and not just keep reading and liking content? Your answers are of value. So, people put in your opinions.